uploadFiles.java

private void uploadFiles() {
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    if (mAccessToken == null) {
                        Log.d(TAG, "need to sign in first");
                        return;
                    }
                    if (StringUtils.isNullOrEmpty(et_uploadFileName.getText().toString())) {
                        Log.d(TAG, "file name is required to upload");
                        return;
                    }

                    String path = getExternalFilesDir(null).getAbsolutePath()
                            + "/" + et_uploadFileName.getText();
                    Log.d(TAG, "run: " + path);
                    java.io.File fileObj = new java.io.File(path);
                    if (!fileObj.exists()) {
                        Log.d(TAG, "file does not exists");
                        return;
                    }

                    Drive drive = buildDrive();
                    Map<String, String> appProperties = new HashMap<>();
                    appProperties.put("appProperties", "property");
                    
                    String dirName = "Uploads";
                    File file = new File();
                    file.setFileName(dirName)
                            .setAppSettings(appProperties)
                            .setMimeType("application/vnd.huawei-apps.folder");
                    directoryCreated = drive.files().create(file).execute();

                    // Upload the file
                    File fileToUpload = new File()
                            .setFileName(fileObj.getName())
                            .setMimeType(mimeType(fileObj))
                            .setParentFolder(Collections.singletonList(directoryCreated.getId()));

                    Drive.Files.Create request = drive.files()
                            .create(fileToUpload, new FileContent(mimeType(fileObj), fileObj));
                    
                    fileUploaded = request.execute();

                    Log.d(TAG, "upload success");
                } catch (Exception e) {
                    Log.d(TAG, "upload error " + e.toString());
                }
            }
        }).start();
    }